My keyboard is not working
Customer: My keyboard is not working anymore.
Helpdesk: Are you sure it's plugged into the computer ?
Customer: No. I can't get behind the computer.
Helpdesk: Pick up your keyboard and walk 10 paces back.
Customer: OK
Helpdesk: Did the keyboard come with you ?
Customer: Yes
Helpdesk: That means the keyboard is not plugged in.
Is there another keyboard ?
Customer: Yes, there's another one here.
Ah...that one does work !